I am limiting my testing to tuner 2 (DVB-S) and on that tuner just one satellite (DISEQC command AB) and am getting peculiar results. (Without repeating this exactly, it looks like I get the same result if I repeat with tuner 1).

Depending on which frequencies I select, I am either able to get the channels "Available" or they "Can not lock".

The results of three different scans are shown below...

With five frequencies selected, 11.156 and 11.627 are not available.
With three frequencies selected (and 11.156 first), then 11.156 becomes available but 11.627 remains unavailable.
With one frequency selected (11.627), then it becomes available.

Is there any explanation for this inconsistency? I would like all frequencies to be locked. Is there any finer control over the scanning process?

Hi @guiri
There could be a number of reasons why this is happening, to better understand the issue, can you please draw your satellite setup installation outlining all the elements for example LNB, DiSEqC switch, multi switch, cable etc...
Also please let us know the model and maker of the different elements

Please refer to the diagram above. There is a single dish with three (identical) universal LNBs on a multi-LNB mount. They are positioned for Astra 2, Astra 1 and Hotbird. I do not know the model number.

Each LNB has four outputs, feeding four (identical) DISEQC switches as shown.
Astra 2 is command AA on the switch.
Astra 1 is command AB on the switch.
Hotbird is command BA on the switch.
The fourth input on the switch (command BB) is unused.

Hi @guiri
Thank you for sending the diagrams
I have escalated this to the R&D for review and will get back to you
Quick question - why do you use 4 separate DiSEqC switches and not 1 with support for 2 devices?

Thanks for the escalation - could you give me some idea of timescales as I have a vbox that I can't really use at the moment until I am sure I can get it to tune properly?

With regards to your question about the choice of switches, I agree it could have been done with a multiswitch but the individual diseqc switch approach minimised the amount of cabling (as they are pole mounted under the dish) - just four cables coming off the pole into the house.

Any attempt to add channels leads to this result. When installing from the beginning and erasing all existing channels everything is ok.
But in case of attemp to add channel to existing channels a have this issue:
scanning:
after scanning:
is this known issue if existing firmware?
please help.

Last edited by amdr1 on Sat Dec 08, 2018 4:21 pm, edited 1 time in total.